Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.31 - Understand how random fertilization produces genetic variation of offspring. Specification Point 3.32 - Know that in human cells the diploid number of chromosomes is 46 and the haploid number is 23. Specification Point 3.33 - Understand that variation within a species can be genetic, environmental, or a combination of both. Specification Point 3.34 - Understand that mutation is a rare, random change in genetic material that can be inherited. Complete set of Chapter 5 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 49 - Ecosystems. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.1 - Understand the terms population, community, habitat and ecosystem. Specification Point 4.2 - Practical: investigate the population size of an organism in two different areas using quadrats. Complete set of Chapter 6 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 4.1 - Understand the terms population, community, habitat and ecosystem. Specification Point 4.2 - Practical: investigate the population size of an organism in two different areas using quadrats. Complete set of Chapter 6 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.3 - Describe the structures of an insect-pollinated and a wind-pollinated flower and explain how each is adapted for pollination. Specification Point 3.4 - Understand that the growth of the pollen tube followed by fertilisation leads to seed and fruit formation. Specification Point 3.5 - Practical: investigate the conditions needed for seed germination. Specification Point 3.6 - Understand how germinating seeds utilise food reserves until the seedling can carry out photosynthesis. Specification Point 3.7 - Understand that plants can reproduce asexually by natural methods (illustrated by runners) and by artificial methods (illustrated by cuttings). Complete set of Chapter 5 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 39 - FSH and LH. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 3.10B - Understand the roles of FSH and LH in the menstrual cycle. Complete set of Chapter 5 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 3.10B - Understand the roles of FSH and LH in the menstrual cycle. Complete set of Chapter 5 Lessons are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 1.2 - Understand how river landscapes change over the course of a river, with distinctive upland and lowland landforms, including the formation of valleys, interlocking spurs, waterfalls, meanders, oxbow lakes, floodplains and levees. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.2 - Understand the abiotic and biotic characteristics of one named coastal ecosystem. Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 1.1 - Understand the hydrological cycle: characteristics, stores and transfers. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.3 - Understand the conflicts between different users of the coast, with different views on coastal management (conservation or development). Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 5.1 - Understand the distributions and characteristics of the world’s biomes (tropical, temperate and boreal forests, tropical and temperate grasslands, deserts and tundra). Complete set of Chapter 6 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 5.3 - Understand the diversification of farming to generate new income streams: GM crops, specialist crops and food, organic farming, recreation and leisure. Complete set of Chapter 6 Lectures are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 8 - The Periodic Table. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.18 - Understand how elements are arranged in the periodic table. Specification Point 1.19 - Understand how to deduce the electronic configurations of the first 20 elements from their positions in the periodic table. Specification Point 1.20 - Understand how to use electrical conductivity and the acid-base character of oxides to classify elements as metals or non-metals. Specification Point 1.21 - Identify an element as a metal or a non-metal according to its position in the periodic table. Specification Point 1.22 - Understand how the electronic configuration of a main group element is related to its position in the periodic table. Specification Point 1.23 - Understand why elements in the same group of the periodic table have similar chemical properties. Specification Point 1.24 - Understand why the noble gases (Group 0) do not readily react. Complete set of Chapter 2 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 1.18 - Understand how elements are arranged in the periodic table. Specification Point 1.19 - Understand how to deduce the electronic configurations of the first 20 elements from their positions in the periodic table. Specification Point 1.20 - Understand how to use electrical conductivity and the acid-base character of oxides to classify elements as metals or non-metals. Specification Point 1.21 - Identify an element as a metal or a non-metal according to its position in the periodic table. Specification Point 1.22 - Understand how the electronic configuration of a main group element is related to its position in the periodic table. Specification Point 1.23 - Understand why elements in the same group of the periodic table have similar chemical properties. Specification Point 1.24 - Understand why the noble gases (Group 0) do not readily react. Complete set of Chapter 2 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.33C - Describe how to carry out an acid-alkali titration. Complete set of Chapter 5 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 22 - Titrations. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.33C - Describe how to carry out an acid-alkali titration. Complete set of Chapter 5 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 1.44 - Know that a covalent bond is formed between atoms by the sharing of a pair of electrons. Specification Point 1.45 - Understand covalent bonds in terms of electrostatic attractions. Specification Point 1.46 - Understand how to use dot-and-cross diagrams to represent covalent bonds in a variety of molecules. Specification Point 1.47 - Explain why substances with a simple molecular structures are gases or liquids, or solids with low melting and boiling points. Specification Point 1.48 - Explain why the melting and boiling points of substances with simple molecular structures increase, in general, with increasing relative molecular mass. Specification Point 1.49 - Explain why substances with giant covalent structures are solids with high melting and boiling points. Specification Point 1.50 - Explain how the structures of diamond, graphite and fullerene influence their physical properties, including electrical conductivity and hardness. Specification Point 1.51 - Know that covalent compounds do not usually conduct electricity. Complete set of Chapter 3 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 13 - Covalent Bonding. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.44 - Know that a covalent bond is formed between atoms by the sharing of a pair of electrons. Specification Point 1.45 - Understand covalent bonds in terms of electrostatic attractions. Specification Point 1.46 - Understand how to use dot-and-cross diagrams to represent covalent bonds in a variety of molecules. Specification Point 1.47 - Explain why substances with a simple molecular structures are gases or liquids, or solids with low melting and boiling points. Specification Point 1.48 - Explain why the melting and boiling points of substances with simple molecular structures increase, in general, with increasing relative molecular mass. Specification Point 1.49 - Explain why substances with giant covalent structures are solids with high melting and boiling points. Specification Point 1.50 - Explain how the structures of diamond, graphite and fullerene influence their physical properties, including electrical conductivity and hardness. Specification Point 1.51 - Know that covalent compounds do not usually conduct electricity. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 1 - States of Matter. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.1 - Understand the three states of matter in terms of the arrangement, movement & energy of the particles. Specification Point 1.2 - Understand the interconversions between the three states of matter in terms of: The names of the interconversions. How they are achieved. The changes in arrangement, movement & energy of the particles. Complete set of Chapter 1 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 3 - Calculating Solubility. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.5C - Know what is meant by the term solubility in the units grams per 100 grams of solvent. Specification Point 1.6C - Understand how to plot and interpret solubility curves. Specification Point 1.7C - Practical: investigate the solubility of a solid in water at a specific temperature. Complete set of Chapter 1 Worksheets are available.